Ransomware is so-called Locky because it scrambles all your important files so that they have the extension Locky. Only the crooks have the decryption key, and you can buy it via the dark web. Backup regularly and keep a recent backup copy off-site. A lot of malware infections rely on persuading you to turn macros back on, so dont do it! The crooks are relying on unsolicited attachments that you shouldn’t open a document attachments.”]
Source: https://nakedsecurity.sophos.com/2016/02/17/locky-ransomware-what-you-need-to-know/